Why do exes claim to have changed when evidently they haven't?

Like mine has a girlfriend but tells me has changed, changed but not in a good way? I don't care if he has changed so why is he telling me? Then got all macho about a man he has a grudge against that took a liking to me, people huh?

wouldn't change mean just never contacting the person again because when your done you have nothing to prove? I see myself as changed as I have no desire to prove myself to anyone, I'm confident in myself not to pretend to people and accept my lot.

So so why do exes do it? Do they think we are doing better in life than them when spent a long time no contact?